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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac039451c15e554c3a685ade246e099fa167b93ea50fc97d50d91aa4102301a4' 
  AND token = 'IT+YxkUbbiuXPeQazh3RnWtgfB7sO+2ud+nHLyyhStA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}